I know not but I just ordered a 4GB (2 x 2GB) kit of DDR3 1.35V for my new low power build. I didn't even know 1.35V existed until I saw a G.Skill ad about a week ago. Here's hoping. Will post some power numbers in a couple of weeks.

I bought 8GB of the G.Skill ECO 1.35v ram for a recent computer build. The memory defaults to running at 1.5v. The 1.35v setting is contained in the XMP extended memory profile, which both lowers the voltage and raises the memory speed. I did not see any noticeable change in system power consumption from the Kill-A-Watt power meter. Power fluctuates even at "idle" depending on what the system is doing, so I wouldn't have been able to see a few watts either way. To use the XMP memory profile your motherboard needs to include XMP support in the bios, and in my case it had to specifically be enabled. Alternatively, I could have manually set the RAM speed and voltage. Maybe keeping the same speed and lowering the voltage would have reduced power consumption.

Low voltage is not necessarily lower power. Anyway, the difference is small and hard to measure. Many "regular" RAMs would work at lower voltage.

All other variables being equal, lower voltage WILL net lower power. But, as you said, the difference will be very small.

In my case the 1.35V RAM was about the same price as regular 1.5-1.65V DDR3, so why not. I expect I'll have to manually set the 1.35V in BIOS, no big deal. This is somewhat like undervolting or overclocking, no guarantee just that margins exist in all these components and seeking those margins can have rewards.

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